package com.hmdp.utils;

import cn.hutool.core.bean.BeanUtil;
import cn.hutool.core.util.StrUtil;
import com.hmdp.dto.UserDTO;
import lombok.RequiredArgsConstructor;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.web.servlet.HandlerInterceptor;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.util.Map;
import java.util.concurrent.TimeUnit;

@RequiredArgsConstructor
public class TokenInterceptor implements HandlerInterceptor {

    private final StringRedisTemplate redisTemplate;
    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        String token = request.getHeader("authorization");
        if(StrUtil.isBlank(token)){

            return true;
        }
        Map<Object, Object> userMap = redisTemplate.opsForHash().entries(RedisConstants.LOGIN_USER_KEY + token);
        //判断用户是否存在
        if(userMap.isEmpty()) {
            //不再存在就拦截
            return true;
        }
        //将查寻到的Hash数据转成UserDto对象

        UserDTO userDTO = BeanUtil.fillBeanWithMap(userMap, new UserDTO(), false);

        //存在，保存用户信息到Threadlocal
        UserHolder.saveUser((UserDTO) userDTO);
        //刷新token的有效期
        redisTemplate.expire(RedisConstants.LOGIN_USER_KEY + token,RedisConstants.LOGIN_USER_TTL, TimeUnit.MINUTES);
        //放行
        return true;
    }

    @Override
    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {
        UserHolder.removeUser();
    }
}
